Concept:The sentence is structurally and contextually correct, so the given words (A), (B), and (C) are already in their proper places.
Explanation:The phrase "little was known" correctly uses the past participle "known" after the verb "was".
"Authorities" refers to the civic officials, which fits logically as the subject of the second clause.
"Ensuring" means making sure, and it pairs naturally with "social distancing".
If we try other arrangements, the sentence becomes awkward or ungrammatical.
For example, "little was authorities" or "civic known" would not make sense.
Since all three words are already in the correct order (A = known, B = authorities, C = ensuring), the sentence does not require any rearrangement.
Answer:No rearrangement required (Option E).